CN103428957A - Light emitting diode driving circuit - Google Patents
Light emitting diode driving circuit Download PDFInfo
- Publication number
- CN103428957A CN103428957A CN2013101587259A CN201310158725A CN103428957A CN 103428957 A CN103428957 A CN 103428957A CN 2013101587259 A CN2013101587259 A CN 2013101587259A CN 201310158725 A CN201310158725 A CN 201310158725A CN 103428957 A CN103428957 A CN 103428957A
- Authority
- CN
- China
- Prior art keywords
- voltage
- power switch
- led
- driving circuit
- reference voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000008878 coupling Effects 0.000 claims description 36
- 238000010168 coupling process Methods 0.000 claims description 36
- 238000005859 coupling reaction Methods 0.000 claims description 36
- 238000004146 energy storage Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 230000001939 inductive effect Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 7
- 230000007717 exclusion Effects 0.000 claims description 6
- 230000002045 lasting effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 11
- 102100040862 Dual specificity protein kinase CLK1 Human genes 0.000 description 7
- 101710170230 Antimicrobial peptide 1 Proteins 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 6
- 101710170231 Antimicrobial peptide 2 Proteins 0.000 description 5
- 101000749294 Homo sapiens Dual specificity protein kinase CLK1 Proteins 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 102100040844 Dual specificity protein kinase CLK2 Human genes 0.000 description 2
- 101000749291 Homo sapiens Dual specificity protein kinase CLK2 Proteins 0.000 description 2
- DIWRORZWFLOCLC-UHFFFAOYSA-N Lorazepam Chemical compound C12=CC(Cl)=CC=C2NC(=O)C(O)N=C1C1=CC=CC=C1Cl DIWRORZWFLOCLC-UHFFFAOYSA-N 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000005693 optoelectronics Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000761456 Nops Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 108010020615 nociceptin receptor Proteins 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000001915 proofreading effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Landscapes
- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A light emitting diode driving circuit is used for driving a light emitting diode module and comprises a bridge rectifier for providing a pulsating direct current voltage, an inductor with one end electrically coupled with the bridge rectifier, a power switch with one end electrically coupled with the other end of the inductor and one end of the light emitting diode module, a first amplifying circuit for converting a first current flowing through the power switch into a first voltage, and a second amplifying circuit for converting a second current flowing through the light emitting diode module into a second voltage; the power switch is controlled to be non-conductive when the first voltage is judged to be greater than or equal to the reference voltage, the second voltage is judged, and the power switch is controlled to be conductive when the second voltage is judged to be less than or equal to the reference voltage, and the first voltage is judged again.
Description
Technical field
The invention relates to a kind of drive circuit, refer to especially a kind of LED driving circuit.
Background technology
Under the background come back in global energy shortage, environmental consciousness, it is the important indicator of the new green energy conservation from generation to generation of exploitation illumination that the energy-conservation and environmental protection of high-luminous-efficiency and environmental contamination reduction is considered.Solid state light emitter is because efficiency is high and without the waste pollution problem of conventional light source, and become the revolutionary product of lower generation illumination, wherein again with light-emitting diode because possessing, luminous efficiency is high, long service life, wide viewing angle, high contrast, volume are little, power saving, not cracky, non-thermal radiation, pollute and manufacture the advantageous feature such as convenient without mercury, and become the emerging lighting source received a lot of attention.
Because the brightness of light-emitting diode is the forward current size that depends on that it flows through, the larger brightness of forward current is higher, but heat energy also can increase relatively, therefore the specification of light-emitting diode all can brightly be applicable to the maximum average current (I used continuously surely
avg) and immediate current peak value (I
Peak); Generally speaking, current peak is greater than average current, and it is the brightest that current peak can make light-emitting diode, can't continue to use, although and average current is less, but can make the brightness of light-emitting diode remain consistent.In order to obtain the galvanic current source from AC power, to export to light-emitting diode, use, the existing fado of doing is used PWM controller, and must utilize at the output of PWM controller rectifier diode and filter capacitor to carry out stable DC output, and need to use the filter capacitor of Da Rong value, so that can't save circuit volume and element cost; And if want to reach the purpose of low harmonic wave and high power factor, generally must additionally pay again the cost that uses power factor corrector, if and directly by AC power after the bridge rectifier rectification, utilize resistance to limit to flow through the size of current of light-emitting diode at the output of bridge rectifier, can be large because of the resistance thermal energy consumption, make electro-optical efficiency low and waste in rain electric power.
Summary of the invention
Therefore, purpose of the present invention, providing a kind of do not need to use power factor corrector and filter capacitor, and directly with AC power as input electric power, and can reach the efficient photoelectricity treater conversion and there is the low humorous high power factor that involves, and can effectively reduce the LED driving circuit of circuit volume and manufacturing cost.
For achieving the above object, LED driving circuit of the present invention, in order to drive the light-emitting diode (LED) module be comprised of several series-parallel light-emitting diodes, this LED driving circuit comprises a bridge rectifier, an inductance, a power switch, one first amplifying circuit, one second amplifying circuit, a switch driving circuit, a generating circuit from reference voltage and a control unit.
This bridge rectifier is accepted an alternating electromotive force and it is carried out to rectification to export a pulsating dc voltage, one end of this inductance and this bridge rectifier electric coupling, to accept this pulsating dc voltage, the other end and this light-emitting diode (LED) module one end be electric coupling forward, this power switch has a first end, one second end and determines this first end and this second end conducting whether controlled end, the other end electric coupling of this first end and this inductance, the second end electric coupling of this first amplifying circuit and this power switch, and according to one first enlargement ratio will flow through this power switch one first electric current corresponding conversion and zoom into one first voltage, this second amplifying circuit, with the other end of this light-emitting diode (LED) module electric coupling forward, and according to one second enlargement ratio will flow through this light-emitting diode (LED) module one second electric current corresponding conversion and zoom into a second voltage, this controlled end electric coupling of this switch driving circuit and this power switch, whether to control this power switch conducting, when this power switch conducting, this first electric current, via this inductance this power switch of flowing through, make this inductive energy storage, and this first amplifying circuit is exported this first voltage, when this not conducting of power switch, this inductance release can, make this second electric current this light-emitting diode (LED) module of flowing through, and this second amplifying circuit is exported this second voltage, this generating circuit from reference voltage produces a reference voltage according to this pulsating dc voltage, this control unit is controlled this switch driving circuit, and accept this first voltage, second voltage and reference voltage input, this control unit is received this first voltage, and when relatively this first voltage is greater than this reference voltage, can control this this power switch of not conducting of switch driving circuit, make this second amplifying circuit export this second voltage to this control unit, and this control unit is when relatively this second voltage is less than this reference voltage, control this this power switch of switch driving circuit conducting, make this first amplifying circuit export this first voltage to this control unit, this control unit is relatively this first voltage and this reference voltage again.
Preferably, this LED driving circuit also comprises the step-down transformer that a turn ratio is N (N>1), in order to an electric main is carried out to step-down, to produce this alternating electromotive force, make the voltage of this alternating electromotive force be less than an overall presure drop of this light-emitting diode (LED) module.
Preferably, this first amplifying circuit comprises one first resistance and one first amplifier, this the first resistance is serially connected in the other end of this power switch, make this first electric current flow through this first resistance to obtain one first pressure drop, and this first amplifier electric is coupled in the contact of this first resistance and this power switch to accept this first pressure drop, and amplifies this first pressure drop according to this first enlargement ratio and export this first voltage; This second amplifying circuit comprises one second resistance and one second amplifier, this the second resistance is serially connected in the other end of this light-emitting diode (LED) module, make this second electric current flow through this second resistance to obtain one second pressure drop, and this second amplifier electric is coupled in the contact of this second resistance and this light-emitting diode (LED) module to accept this second pressure drop, and amplifies this second pressure drop according to this second enlargement ratio and export this second voltage.
Preferably, this generating circuit from reference voltage comprises one the 3rd resistance and one the 4th resistance of series connection, the 3rd resistance other end ground connection wherein, the 4th resistance other end is accepted this pulsating dc voltage input, so that this pulsating dc voltage is carried out to dividing potential drop, and obtain the 3rd ohmically pressure drop as this reference voltage from the contact of the 3rd resistance and the 4th resistance.
Preferably, a continuous current rated value of this light-emitting diode (LED) module is I
LED, CONT, and this LED driving circuit is set this continuous current rated value and is had a safe ratio F of specification that is less than 1
DeRate, make
The first enlargement ratio
The second enlargement ratio
Preferably, this control unit comprises 2X1 multiplexer, a comparator and a D type flip-flop of accepting this first voltage and second voltage, one end of this comparator is connected with the output of this 2X1 multiplexer, its other end is for this reference voltage input, and its output is connected with the D end of this D type flip-flop, this D type flip-flop moves according to first pulse signal that is connected to its pulse input end, and its Q end and this switch driving circuit electric coupling, by this switch driving circuit, whether to control this power switch conducting, when the Q of this D type flip-flop end is logical one, this 2X1 multiplexer is selected this first voltage of output, and when this comparator when relatively this first voltage is less than this reference voltage, this comparator continues output logic 1 to this D type flip-flop, make to control this this power switch of switch driving circuit conducting, and control the lasting selection of this 2X1 multiplexer and export this first voltage, until this comparator is when relatively this first voltage is more than or equal to this reference voltage, this comparator output logic 0 is given this D type flip-flop, make to control this this power switch of not conducting of switch driving circuit, control this 2X1 multiplexer simultaneously and select this second voltage of output, and when this comparator when relatively this second voltage is greater than this reference voltage, this comparator continues output logic 0 to this D type flip-flop, until this comparator is when relatively this second voltage is less than or equal to this reference voltage, this comparator output logic 1 is given this D type flip-flop, and control this 2X1 multiplexer simultaneously and select this first voltage of output to this comparator.
Preferably, this control unit also comprises a mutual exclusion or lock and one or lock, one input of this mutual exclusion or lock connects the D end of this D type flip-flop, another input connects the Q end of this D type flip-flop, and its output connects an input of this or lock, this first pulse signal connects another input of this or lock, and should or the output of lock connect the pulse input end of this D type flip-flop, make this D type flip-flop according to should or one second pulse signal running of lock output.
Preferably, this LED driving circuit also comprises flow point volt circuit always, and this control unit is except above-mentioned execution mode, its another execution mode is to comprise first, second, the the 3rd and the 4th totally four analog-digital converters and a correction module, wherein this DC voltage divider circuit comprises a filter circuit and a bleeder circuit, this filter circuit carries out filtering to export a direct current voltage to this pulsating dc voltage, this bleeder circuit carries out dividing potential drop and exports a tertiary voltage this direct voltage, this first analog-digital converter turns to the first magnitude of voltage by this first voltage numerical digit, this second analog-digital converter turns to the second voltage value by this second voltage numerical digit, the 3rd analog-digital converter turns to reference voltage level by this reference voltage numerical digit, the 4th analog-digital converter turns to the tertiary voltage value by this tertiary voltage numerical digit, this correction module is according to a default standard voltage value, setting a corrected value is that this standard voltage value is divided by this tertiary voltage value, and proofread and correct this reference voltage level with this corrected value, make reference voltage level after this correction equal this corrected value and be multiplied by this reference voltage level.
Preferably, above-mentioned this control unit also comprises a judge module, this judge module is received this first magnitude of voltage, and in this first magnitude of voltage of judgement during the reference voltage level after being greater than this correction, control this this power switch of not conducting of switch driving circuit, otherwise, control this this power switch of switch driving circuit conducting, and this judge module is received this second voltage value, and in this second voltage value of judgement during the reference voltage level after being less than or equal to this correction, control this this power switch of switch driving circuit conducting, otherwise, control this this power switch of not conducting of switch driving circuit.
Moreover, the another kind of LED driving circuit of the present invention, in order to drive the light-emitting diode (LED) module be comprised of several series-parallel light-emitting diodes, this LED driving circuit comprises a bridge rectifier, an inductance, a power switch, an amplifying circuit, a switch driving circuit, a generating circuit from reference voltage and a control unit.
This bridge rectifier is accepted an alternating electromotive force and it is carried out to rectification to export a pulsating dc voltage, one end of this inductance and this bridge rectifier electric coupling, to accept this pulsating dc voltage, the other end and this light-emitting diode (LED) module one end be electric coupling forward, and the other end ground connection of this light-emitting diode (LED) module, this power switch has a first end, one second end and determines this first end and this second end conducting whether controlled end, the other end electric coupling of this first end and this inductance, the second end electric coupling of this amplifying circuit and this power switch, and according to an enlargement ratio will flow through this power switch one first electric current corresponding conversion and zoom into one first voltage, whether this switch driving circuit is in order to control this power switch conducting, when this power switch conducting, this first electric current is via this inductance this power switch of flowing through, make this inductive energy storage, and this amplifying circuit is exported this first voltage, when this not conducting of power switch, this inductance release can, make flow through this light-emitting diode (LED) module to order about this light-emitting diode (LED) module luminous of one second electric current, this generating circuit from reference voltage produces a reference voltage according to this pulsating dc voltage, this control unit is controlled this switch driving circuit, and accept the input of this first voltage and reference voltage, and comprise a timer, when this control unit judges that this first voltage is less than this reference voltage, make this this power switch of switch driving circuit conducting, otherwise make this this power switch of not conducting of switch driving circuit, and start this timer and make one scheduled time of timing, and judge when this timer timing reaches this scheduled time, make this this power switch of switch driving circuit conducting, while forbidden energy this timer that makes zero, to receive once again and relatively this first voltage and this reference voltage.
Preferably, this LED driving circuit also comprises flow point volt circuit always, and this control unit also comprises three analog-digital converters, one correction module and a judge module, this DC voltage divider circuit comprises a filter circuit and a bleeder circuit, this filter circuit carries out filtering to export a direct current voltage to this pulsating dc voltage, this bleeder circuit carries out dividing potential drop and exports a tertiary voltage this direct voltage, these analog-digital converters are respectively by this first voltage, reference voltage and tertiary voltage numerical digit turn to the first magnitude of voltage, reference voltage level and tertiary voltage value, this correction module is preset with a standard voltage value, and setting a corrected value is that this standard voltage value is divided by this tertiary voltage value, and proofread and correct this reference voltage level with this corrected value, make reference voltage level after this correction equal this corrected value and be multiplied by this reference voltage level, when this judge module is received this first magnitude of voltage, and while judging the reference voltage level after this first magnitude of voltage is less than this correction, make this this power switch of switch driving circuit conducting, otherwise make this this power switch of not conducting of switch driving circuit, and when starting this timer and making timing reach this scheduled time, make this this power switch of switch driving circuit conducting, simultaneously forbidden energy this timer that makes zero, to receive once again and the reference voltage level after this first magnitude of voltage and this correction relatively.
In addition, another LED driving circuit of the present invention, in order to drive the light-emitting diode (LED) module be comprised of several series-parallel light-emitting diodes, this LED driving circuit comprises a bridge rectifier, an inductance, a power switch, an amplifying circuit, a switch driving circuit, a generating circuit from reference voltage and a control unit.
This bridge rectifier is accepted an alternating electromotive force and it is carried out to rectification to export a pulsating dc voltage; One end of this inductance and this bridge rectifier electric coupling, to accept this pulsating dc voltage, the other end and this light-emitting diode (LED) module one end be electric coupling forward; This power switch has a first end, one second end and determines this first end and this second end conducting whether controlled end, the other end electric coupling of this first end and this inductance, this second end ground connection; The other end electric coupling of this amplifying circuit and this light-emitting diode (LED) module, and according to an enlargement ratio will flow through this light-emitting diode (LED) module one second electric current corresponding conversion and zoom into a second voltage; Whether this switch driving circuit is in order to control this power switch conducting, when this power switch conducting, one first electric current is via this inductance this power switch of flowing through, make this inductive energy storage, when this not conducting of power switch, this inductance release can, make flow through this light-emitting diode (LED) module to order about this light-emitting diode (LED) module luminous of this second electric current, and this amplifying circuit is exported this second voltage; This generating circuit from reference voltage produces a reference voltage according to this pulsating dc voltage; This control unit is controlled this switch driving circuit, and accept the input of this second voltage and reference voltage, and comprise a timer, when this control unit judges that this second voltage is less than or equal to this reference voltage, make this this power switch of switch driving circuit conducting, and start this timer and make one scheduled time of timing, and judge when this timer timing reaches this scheduled time, make this this power switch of not conducting of switch driving circuit, simultaneously forbidden energy this timer that makes zero, to receive once again and relatively this second voltage and this reference voltage.
Preferably, this LED driving circuit also comprises flow point volt circuit always, and this control unit also comprises three analog-digital converters, one correction module and a judge module, this DC voltage divider circuit comprises a filter circuit and a bleeder circuit, this filter circuit carries out filtering to export a direct current voltage to this pulsating dc voltage, this bleeder circuit carries out dividing potential drop and exports a tertiary voltage this direct voltage, these analog-digital converters are respectively by this second voltage, reference voltage and tertiary voltage numerical digit turn to the second voltage value, reference voltage level and tertiary voltage value, this correction module is preset with a standard voltage value, and setting a corrected value is that this standard voltage value is divided by this tertiary voltage value, and proofread and correct this reference voltage level with this corrected value, make reference voltage level after this correction equal this corrected value and be multiplied by this reference voltage level, when this judge module judges the reference voltage level after this second voltage value is less than or equal to this correction, make this this power switch of switch driver conducting, and start this timer, while making timing reach this scheduled time, make this this power switch of not conducting of switch driver, simultaneously forbidden energy this timer that makes zero, to receive once again and the reference voltage level after this second voltage value and this correction relatively.
Beneficial effect of the present invention is not need to use power factor corrector and filter capacitor, and directly with AC power as input electric power, can reach the high efficiency opto-electronic conversion and there is the low humorous high power factor that involves, and effectively reduce circuit volume and manufacturing cost, really reach effect of the present invention and purpose.
Attached The figure explanation
Fig. 1 is the main circuit schematic diagram of the first preferred embodiment of LED driving circuit of the present invention.
Fig. 2 is the inductive current i of first embodiment of the invention
LA upper limit current i
UPAn and lower current i
DNThe scope schematic diagram.
Fig. 3 is the detailed circuit diagram of the control unit of first embodiment of the invention.
Fig. 4 is the main circuit schematic diagram of the second preferred embodiment of LED driving circuit of the present invention, the wherein detailed circuit diagram of indicative control unit.
Fig. 5 is the main circuit schematic diagram of the 3rd preferred embodiment of LED driving circuit of the present invention, the wherein detailed circuit diagram of indicative control unit.
Fig. 6 is the main circuit schematic diagram of the 4th preferred embodiment of LED driving circuit of the present invention, the wherein detailed circuit diagram of indicative control unit.
Fig. 7 is the main circuit schematic diagram of the 5th preferred embodiment of LED driving circuit of the present invention, the wherein detailed circuit diagram of indicative control unit.
[main element symbol description]
10 light-emitting diode (LED) module 21 bridge rectifiers
22 first amplifying circuit 23 second amplifying circuits
24 switch driving circuit 25 generating circuit from reference voltage
26 microcontroller 27 2X1 multiplexers
28 comparator 29 DC voltage divider circuits
260 timer 263 first analog-digital converters
264 second analog-digital converter 265 the 3rd analog-digital converters
266 the 4th analog-digital converter 267 correction modules
268 judge module 291 filter circuits
292 bleeder circuits
T1 step-down transformer C electric capacity
VB pulsating dc voltage i
1The first electric current
I
2The second electric current L1 inductance
D1 light-emitting diode Q1 power switch
VR1 first pressure drop VR2 the second pressure drop
V1A the first voltage V2A second voltage
V1 the first magnitude of voltage V2 second voltage value
A1 first enlargement ratio A2 the second enlargement ratio
AMP1 first amplifier AMP2 the second amplifier
R1 the first resistance R 2 second resistance
R3 the 3rd resistance R 4 the 4th resistance
R5 the 5th resistance R 6 the 6th resistance
Reference voltage level after VREF_CAL proofreaies and correct
VREF_A reference voltage VREF reference voltage level
DC_A tertiary voltage DC tertiary voltage value
CLK1 first pulse signal CLK2 the second pulse signal.
Embodiment
About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description in following cooperation with reference to the preferred embodiment of accompanying drawing, can clearly present.
Shown in Figure 1, LED driving circuit of the present invention is the light-emitting diode (LED) module 10 that is formed or at least comprised a light-emitting diode D1 by several series-parallel light-emitting diode D1 in order to drive, and its first preferred embodiment mainly comprises a bridge rectifier 21, an inductance L 1, a power switch Q1, one first amplifying circuit 22, one second amplifying circuit 23, a switch driving circuit 24, a generating circuit from reference voltage 25 and a control unit 26.
Preferably, power switch Q1 is a metal-oxide-semifield-effect electric crystal (MOSFET) switch, and the other end of its first end (drain) and inductance L 1 and an end of light-emitting diode (LED) module 10 be electric coupling forward.
The second end (drain) electric coupling of the first amplifying circuit 22 and power switch Q1, and according to will flow through one first current i of power switch Q1 of one first enlargement ratio A1
1Corresponding conversion also zooms into one first voltage V1A, the first amplifying circuit 22 comprises one first resistance R 1 and one first amplifier AMP1 in the present embodiment, the first resistance R 1 one ends connect the second end (drain) of power switch Q1, and other end ground connection, make the first current i
1 First resistance R 1 of flowing through, to produce one first pressure drop VR1 on the first resistance R 1.The first amplifier AMP1 connects the end be connected with power switch Q1 of the first resistance R 1, to obtain the first pressure drop VR1 and it is amplified to the first enlargement ratio A1 to export the first voltage V1A to control unit 26.
The other end electric coupling of the second amplifying circuit 23 and light-emitting diode (LED) module 10, and according to will flow through one second current i of light-emitting diode (LED) module 10 of one second enlargement ratio A2
2Corresponding conversion also zooms into a second voltage V2A, and the second amplifying circuit 23 comprises one second resistance R 2 and one second amplifier AMP2, second resistance R 2 one end connecting luminous diode module 10 other ends, and its other end ground connection, make the second current i
2Second resistance R 2 of flowing through, to produce one second pressure drop VR2 on the second resistance R 2.The second amplifier AMP2 connects the end be connected with light-emitting diode (LED) module 10 of the second resistance R 2 to obtain the second pressure drop VR2, and it is amplified to the second enlargement ratio A2 to export second voltage V2A to control unit 26.And the resistance of the second resistance R 2 is identical with the first resistance R 1 in the present embodiment.
Generating circuit from reference voltage 25 is connected with control unit 26, and produces a reference voltage VREF_A according to pulsating dc voltage VB.The generating circuit from reference voltage 25 of the present embodiment comprises one the 3rd resistance R 3 and one the 4th resistance R 4 of series connection, the 3rd resistance R 3 other end ground connection wherein, the 4th resistance R 4 other ends are accepted pulsating dc voltage VB input, so that pulsating dc voltage VB is carried out to dividing potential drop, and obtain pressure drop the 3rd resistance R 3 as reference voltage VREF_A and offer control unit 26 from the contact of the 3rd resistance R 3 and the 4th resistance R 4.
And as shown in Figure 2,, for stably driving light-emitting diode (LED) module 10, the control unit 26 of the present embodiment need to be by inductive current i
LBe limited in a upper limit current i
UPAn and lower current i
DNBetween, even also the first current i
1Be no more than upper limit current i
UP, and the second current i
2Be no more than lower current i
DN, therefore, the first enlargement ratio A1 must be in the first current i
1Reach upper limit current i
UPThe time, make the first voltage V1A of the first amplifier AMP1 output be more than or equal to reference voltage VREF_A, be also the first enlargement ratio A1 and the first current i of the first amplifier AMP1
1First resistance R 1 of flowing through, and the generating circuit from reference voltage 25 (the 3rd resistance R 3 and the 4th resistance R 4) of generation reference voltage VREF_A is relevant; In like manner, the second enlargement ratio A2 must be in the second current i
2Reach lower current i
DNThe time, make the second voltage V2A of the second amplifier AMP2 output be less than or at least equal this reference voltage VREF_A, be also the second enlargement ratio A2 and the second current i of the second amplifier AMP2
2Second resistance R 2 of flowing through, and the generating circuit from reference voltage 25 (the 3rd resistance R 3 and the 4th resistance R 4) of generation reference voltage VREF_A is relevant.
In addition, the continuous current rated value due to known luminescence diode (led) module 10 is I
LED, CONT, for allowing the second current i of light-emitting diode (LED) module 10 of flowing through
2The unlikely continuous current rated value I that surpasses light-emitting diode (LED) module 10 of root-mean-square value
LED, CONT, the present embodiment is set the second current i
2Root-mean-square value be this continuous current rated value I
LED, CONTBe multiplied by a safe ratio F of specification that is less than 1
DeRate, and the first enlargement ratio A1 of the first amplifier AMP1 also with a upper limit coefficient F who is greater than 1
RIP, UP, alternating electromotive force V
AC, the turn ratio N of step-down transformer T1, the continuous current rated value I of light-emitting diode (LED) module 10
LED, CONTAnd the safe ratio F of specification of continuous current rated value
DeRateRelevant, make the first enlargement ratio
The second enlargement ratio
And if the resistance of the second resistance R 2 is identical with the first resistance R 1,
The second enlargement ratio
Controlled end (gate) electric coupling of switch driving circuit 24 and power switch Q1, in order to the drain of power ratio control switch Q1 and source electrode conducting whether, when power switch, Q1 is switched on, the first current i
1Via the inductance L 1 power switch Q1 that flows through, make inductance L 1 energy storage (charging), first amplifying circuit 22 output the first voltage V1A simultaneously, when not conducting of power switch Q1, inductance L 1 is released can (electric discharge), and produces the second current i
2The light-emitting diode (LED) module 10 of flowing through, make light-emitting diode (LED) module 10 luminous, simultaneously the second amplifying circuit 23 output second voltage V2A.
Particularly, as shown in Figure 3, the control unit 26 of LED driving circuit the first preferred embodiment of the present invention comprises 2X1 multiplexer 27, a comparator 28 and the D type flip-flop D_FF of acceptance first a voltage V1A and second voltage V2A.One end (negative terminal) of comparator 28 is connected with the output of 2X1 multiplexer 27, its other end (anode) supply reference voltage VREF_A input, and its output is connected with the D end of D type flip-flop D_FF.D type flip-flop D_FF moves according to first a pulse signal CLK1 who is connected to its pulse input end CLK, and its Q end is selected the input electric coupling with one of switch driving circuit 24 and 2X1 multiplexer 27, whether to pass through switch driving circuit 24 power ratio control switch Q1 conductings, and control 2X1 multiplexer 27 simultaneously and select this first voltage V1A or this second voltage V2A.
Whereby, when the Q of this D type flip-flop end is logical one, 2X1 multiplexer 27 selects output the first voltage V1A to comparator 28, and when comparator 28 comparison the first voltage V1A are less than reference voltage VREF_A, comparator 28 output logics 1 are given D type flip-flop D_FF, make the Q end output logic 1 control switch drive circuit 24 conducting power switch Q1 of D type flip-flop D_FF, inductance L 1 continues energy storage, the first voltage V1A is continued to increase, the Q end of D type flip-flop D_FF is controlled lasting output the first voltage V1A that selects of 2X1 multiplexer 27 simultaneously, until comparator 28 is when relatively the first voltage V1A are more than or equal to reference voltage VREF_A, comparator 28 output logics 0 are given D type flip-flop D_FF, make the Q end output logic 0 control switch drive circuit 24 not conducting power switch Q1 of D type flip-flop D_FF, inductance L 1 starts light-emitting diode (LED) module 10 is released can, and produce the second current i
2the light-emitting diode (LED) module 10 of flowing through, and it is luminous to order about light-emitting diode (LED) module 10, the Q end of D type flip-flop D_FF is controlled 2X1 multiplexer 27 and is selected output second voltage V2A simultaneously, now because second voltage V2A is greater than reference voltage VREF_A, therefore when comparator 28 comparison second voltage V2A are greater than reference voltage VREF_A, comparator 28 continues output logic 0 to this D type flip-flop, make output logic 0 control switch drive circuit 24 continue not conducting power switch Q1, and second voltage V2A is because inductance L 1 is released energy, the second current i 2 reduces gradually and descends, when comparator 28 comparison second voltage V2A are less than or equal to reference voltage VREF_A, comparator output logic 1 is given D type flip-flop D_FF, make control switch drive circuit 24 conducting power switch Q1 again, allow inductance L 1 energy storage once more, and control 2X1 multiplexer 27 simultaneously and select output V1A the first voltage to comparator, repeatedly operate and driven light-emitting diode (LED) module 10 luminous by foregoing circuit.
Separately shown in Figure 4, the control unit 26 of LED driving circuit the second preferred embodiment of the present invention, except above-mentioned the first preferred embodiment, also comprises a mutual exclusion or lock XOR and one or lock OR.The input of mutual exclusion or lock XOR connects the D end of D type flip-flop D_FF, another input connects the Q end of D type flip-flop D_FF, and its output connects or the input of lock OR, and the first pulse signal CLK1 (pulse is more narrow better) connects or another input of lock OR, and or the output of lock OR connects the pulse input end CLK of D type flip-flop D_FF, the one second pulse signal CLK2 running that D type flip-flop D_FF basis or lock OR are exported (being generally that positive edge triggers).Whereby, when the D input of D type flip-flop D_FF and the moment of Q output one generation opposite states, can produce the pulse input end CLK that an extra triggering signal is input to this D type flip-flop D_FF, the Q end output of D type flip-flop D_FF can be synchronizeed with the input of D end, and do not need the next working pulse arrival of waiting for the first pulse CLK1 just to be triggered, therefore can more instant 24 conductings of control switch drive circuit or not conducting power switch Q1 (in time), the unlikely control range that surpasses of variation of the second current i 2 of light-emitting diode (LED) module 10 makes to flow through, and can more stably drive light-emitting diode (LED) module 10.
Shown in Figure 5 again, the 3rd preferred embodiment of LED driving circuit of the present invention, except comprising above-mentioned bridge rectifier 21, inductance L 1, power switch Q1, the first amplifying circuit 22, the second amplifying circuit 23, switch driving circuit 24, generating circuit from reference voltage 25, control unit 26 and transformer T1, also comprises a DC voltage divider circuit 29 be electrically connected to control unit 26.Wherein DC voltage divider circuit 29 comprises a filter circuit 291 and a bleeder circuit 292,291 couples of pulsating dc voltage VB of filter circuit carry out filtering to export a direct current voltage, one the 5th resistance R 5 that bleeder circuit 292 comprises series connection and one the 6th resistance R 6, the 5th resistance R 5 other end ground connection wherein, the 6th resistance R 6 other ends and filter circuit 291 couple, its direct voltage to filter circuit 291 output carries out dividing potential drop, to get pressure drop on the 5th resistance R 5 as a tertiary voltage DC_A and to offer control unit 26.
Control unit 26 in the present embodiment is digital signal processors, and its first preferred embodiment comprises the first, second, third and the 4th totally four analog-digital converters 263～266, a correction module 267 and judge modules 268.The first analog-digital converter 263 changes into the first magnitude of voltage V1 by the first voltage V1A numerical digit, the second analog-digital converter 264 changes into second voltage value V2 by second voltage V2A numerical digit, the 3rd analog-digital converter 265 changes into reference voltage level VREF with reference to voltage VREF_A numerical digit, and the 4th analog-digital converter changes into a tertiary voltage value DC by tertiary voltage DC_A numerical digit.Correction module (formula) 267 is accepted the 3rd and the 4th analog-digital converter 265, reference voltage level VREF and the tertiary voltage value DC of 266 outputs out of the ordinary, and be preset with a standard DC voltage value DC_STD (from the value of standard pulsating dc voltage VB sampling) in correction module 267, correction module 267 is tried to achieve one corrected value=standard DC voltage value DC_STD/ tertiary voltage value DC according to standard DC voltage value DC_STD and tertiary voltage value DC, and proofread and correct this reference voltage level with corrected value, make the reference voltage level VREF_CAL=corrected value x reference voltage level VREF after correction, and the reference voltage level VREF_CAL after output calibration is to judge module 268.Whereby, the reference voltage level VREF_CAL after can avoiding proofreading and correct is subject to the impact of pulsating dc voltage VB fluctuation.
Judge module (formula) 268 is accepted first and second analog-digital converter 263, 264 the first magnitude of voltage V1 and the second voltage value V2 that export respectively, when power switch Q1 conducting, judge module 268 reads the first magnitude of voltage V1, and judge the reference voltage level VREF_CAL after whether the first magnitude of voltage V1 is more than or equal to correction, if not, export control signal S control switch drive circuit 24 and continue conducting power switch Q1, make inductance L 1 continue energy storage, if, export control signal S control switch drive circuit 24 not conducting power switch Q1, 1 pair of light-emitting diode (LED) module 10 of inductance L is released can, and it is luminous to order about light-emitting diode (LED) module 10, then, judgement judge module 268 reads second voltage value V2, and judge the reference voltage level VREF_CAL after whether second voltage value V2 is less than or equal to correction, if not, export control signal S control switch drive circuit 24 and continue not conducting power switch Q1, making inductance L 1 continue light-emitting diode (LED) module 10 is released can, if, export control signal S control switch drive circuit 24 conducting power switch Q1, make inductance L 1 energy storage again, and again read the first magnitude of voltage V1, to carry out above-mentioned judgement action.Repeatedly judge the first magnitude of voltage V1 and second voltage value V2 corresponding power ratio control switch Q1 running by judge module 268, allow inductance L 1 repeatedly energy storage and release can and reach and drive the luminous purpose of light-emitting diode (LED) module 10.
It is worth mentioning that, judge module 268 often completes and once judges and export control signal S and be the update cycle of control signal S to time of switch driving circuit 24, and the inverse of this update cycle is renewal frequency.If need the change update cycle, only need in judge module 268, add the NOPs (abbreviation of No Operation, mean without operation) instruction, make judge module 268 not do any action and postpone a period of time to export again control signal S, it is the variable update cycle, if and need the fixing update cycle, the time of judge module 268 being inserted the set time to (for example 10 microseconds) interrupts can achieving the goal in secondary formula.
Shown in Figure 6 again, the most of circuit of the 4th preferred embodiment of LED driving circuit of the present invention and the 3rd embodiment is identical, main difference be in: the present embodiment has omitted the second amplifying circuit 23 and the 3rd analog-digital converter 264, is also that 26 of control units are accepted the first voltage V1A, reference voltage VREF_A and tertiary voltage DC_A input.In addition, also be provided with a timer 260 (formula) in the judge module 268 of control unit 26, when power switch Q1 conducting, judge module 268 reads the first voltage V1A, and judge the reference voltage level VREF_CAL after whether the first voltage V1A is greater than correction, if not, control switch drive circuit 24 continues conducting power switch Q1, make inductance L 1 continue energy storage, if, control switch drive circuit 24 not conducting power switch Q1, 1 pair of light-emitting diode (LED) module 10 of inductance L is released can, to order about lumination of light emitting diode, start timing with seasonal timer 260, then judge whether timing reaches a Preset Time to timer 260, and in the present embodiment, can be according to measuring the second current i in above-mentioned the first embodiment
2drop to the time empirical value that makes second voltage value V2 be less than or equal to the reference voltage level VREF_CAL after correction and set this Preset Time, but not as limit.Therefore, when judge module 268 judgement timers 260 are not yet counted while reaching setting-up time, control switch drive circuit 24 continues not conducting power switch Q1, making inductance L 1 continue light-emitting diode (LED) module 10 is released can, until having counted, judge module 268 judgement timers 260 reach Preset Time, make timer 260 stop timing, and control switch drive circuit 24 conducting power switch Q1, make inductance L 1 energy storage again, until judge module 268 judges the reference voltage level VREF_CAL after the first magnitude of voltage V1 is more than or equal to correction again, again make timer 260 reclockings, and control switch drive circuit 24 not conducting power switch Q1, inductance L 1 is released light-emitting diode (LED) module 10 again can, running repeatedly whereby, allow inductance L 1 carry out energy storage repeatedly and release can and can reach equally and drive the luminous purpose of light-emitting diode (LED) module 10.
In like manner, as shown in Figure 7, the most of circuit of the 5th preferred embodiment of LED driving circuit of the present invention and the 3rd embodiment is identical, main difference be in: the present embodiment has omitted the first amplifying circuit 22 and the first analog-digital converter 263, be also that 26 of control units are accepted second voltage V2A, reference voltage VREF_A and tertiary voltage DC_A input, and also be provided with a timer 260 (formula) in the judge module 268 of control unit 26, judge module 268 makes switch driving circuit 24 conducting power switch Q1 at the beginning, and make timer 260 start timing, then judge whether timing reaches a Preset Time to timer 260, and the present embodiment equally can be according to measuring the first current i in the first embodiment
1rise to the time empirical value that makes the first voltage V1A be more than or equal to the reference voltage level VREF_CAL after correction and set Preset Time, but not as limit.
Therefore, when judge module 268 judgement timers 260 are not yet counted and reached Preset Time, control switch drive circuit 24 continues conducting power switch Q1, make inductance L 1 continue energy storage, until judge module 268 judgement timer 260 countings reach setting-up time, make timer 260 stop timing, and control switch drive circuit 24 not conducting power switch Q1, 1 pair of light-emitting diode (LED) module 10 of inductance L is released can, luminous to order about light-emitting diode (LED) module 10, judge module 268 then judges the reference voltage level VREF_CAL after whether second voltage value V2 is less than correction, if not, control switch drive circuit 24 continues not conducting power switch Q1, making inductance L 1 continue light-emitting diode (LED) module 10 is released can, if, again make timer 260 reclockings, and control switch drive circuit 24 conducting power switch Q1, make inductance L 1 energy storage again, running repeatedly whereby, make inductance repeatedly energy storage and release can and reach and drive the luminous purpose of light-emitting diode (LED) module 10.
Certainly, also can comprise the function mode of above-mentioned four embodiment in control unit 26 simultaneously, and be set as respectively four options such as pattern 1, pattern 2, mode 3 and pattern 4, select the type of drive of wanting for the user.
Moreover, it is worth mentioning that, although above-described embodiment is with AC power V
ACDriving electric power as light-emitting diode (LED) module 10, but also can accept DC power supply, also as long as the transformer T1 in above-described embodiment and bridge rectifier 21 are taken away, allow DC power supply directly input inductance L 1, and DC power supply must be less than the overall presure drop of light-emitting diode (LED) module 10, the remaining circuit function mode is identical with above-described embodiment.
In addition, in the embodiment of Fig. 1 and Fig. 3 to Fig. 7, the instantaneous short circuit of closing at power switch Q1 for the rectifier diode (not shown) of avoiding in bridge rectifier 21, can be in the output of bridge rectifier 21 a little capacitor C in parallel, the selection of its appearance value take that to avoid bridge rectifier short circuit and minimization harmonic distortion be principle, for example 470nF.
In sum, above-described embodiment does not need to use power factor corrector and filter capacitor, and directly with AC power as input electric power, can reach the high efficiency opto-electronic conversion and there is the low humorous high power factor that involves, and effectively reduce circuit volume and manufacturing cost, really reach effect of the present invention and purpose.
Claims (13)
1. a LED driving circuit, is characterized in that, in order to drive the light-emitting diode (LED) module be comprised of several series-parallel light-emitting diodes, this LED driving circuit comprises:
A bridge rectifier, accept an alternating electromotive force and it carried out to rectification to export a pulsating dc voltage;
An inductance, an end and this bridge rectifier electric coupling, to accept this pulsating dc voltage, the other end and this light-emitting diode (LED) module one end be electric coupling forward;
A power switch, have a first end, second end and one and determine this first end and this second end conducting whether controlled end, the other end electric coupling of this first end and this inductance;
First amplifying circuit, with the second end electric coupling of this power switch, and according to first enlargement ratio will flow through this power switch first an electric current corresponding conversion and zoom into first voltage;
Second amplifying circuit, with the other end of this light-emitting diode (LED) module electric coupling forward, and according to second enlargement ratio will flow through this light-emitting diode (LED) module second an electric current corresponding conversion and zoom into a second voltage;
A switch driving circuit, this controlled end electric coupling with this power switch, whether to control this power switch conducting, when this power switch conducting, this first electric current is via this inductance this power switch of flowing through, make this inductive energy storage, and this first amplifying circuit is exported this first voltage, when this not conducting of power switch, this inductance is released can, make this second electric current this light-emitting diode (LED) module of flowing through, and this second amplifying circuit is exported this second voltage;
A generating circuit from reference voltage, produce a reference voltage according to this pulsating dc voltage; And
A control unit, control this switch driving circuit, and accept this first voltage, second voltage and reference voltage input, this control unit is received this first voltage, and when relatively this first voltage is greater than this reference voltage, can control this this power switch of not conducting of switch driving circuit, make this second amplifying circuit export this second voltage to this control unit, and this control unit is when relatively this second voltage is less than this reference voltage, control this this power switch of switch driving circuit conducting, make this first amplifying circuit export this first voltage to this control unit, this control unit is relatively this first voltage and this reference voltage again.
2. LED driving circuit as claimed in claim 1, it is characterized in that, also comprise the step-down transformer that a turn ratio is N, in order to an electric main is carried out to step-down, to produce this alternating electromotive force, make the voltage of this alternating electromotive force be less than an overall presure drop of this light-emitting diode (LED) module, wherein N>1.
3. LED driving circuit as claimed in claim 2, it is characterized in that, this first amplifying circuit comprises first resistance and first amplifier, this the first resistance is serially connected in the other end of this power switch, make this first electric current flow through this first resistance to obtain first pressure drop, and this first amplifier electric is coupled in the contact of this first resistance and this power switch to accept this first pressure drop, and amplifies this first pressure drop according to this first enlargement ratio and export this first voltage; This second amplifying circuit comprises one second resistance and one second amplifier, this the second resistance is serially connected in the other end of this light-emitting diode (LED) module, make this second electric current flow through this second resistance to obtain one second pressure drop, and this second amplifier electric is coupled in the contact of this second resistance and this light-emitting diode (LED) module to accept this second pressure drop, and amplifies this second pressure drop according to this second enlargement ratio and export this second voltage.
4. LED driving circuit as claimed in claim 3, it is characterized in that, this generating circuit from reference voltage comprises the 3rd resistance and the 4th resistance of series connection, the 3rd resistance other end ground connection wherein, the 4th resistance other end is accepted this pulsating dc voltage input, so that this pulsating dc voltage is carried out to dividing potential drop, and obtain the 3rd ohmically pressure drop as this reference voltage from the contact of the 3rd resistance and the 4th resistance.
5. LED driving circuit as claimed in claim 4, is characterized in that, a continuous current rated value of this light-emitting diode (LED) module is I
LED, CONT, and this LED driving circuit is set this continuous current rated value and is had one and be less than 1 the safe ratio F of specification
DeRate, make
The first enlargement ratio
The second enlargement ratio
6. LED driving circuit as claimed in claim 5, it is characterized in that, this control unit comprises that one is accepted the 2X1 multiplexer of this first voltage and second voltage, a comparator and a D type flip-flop, one end of this comparator is connected with the output of this 2X1 multiplexer, its other end is for this reference voltage input, and its output is connected with the D end of this D type flip-flop, this D type flip-flop is according to first a pulse signal action that is connected to its pulse input end, and its Q end and this switch driving circuit electric coupling, by this switch driving circuit, whether to control this power switch conducting, when the Q of this D type flip-flop end is logical one, this 2X1 multiplexer is selected this first voltage of output, and when this comparator when relatively this first voltage is less than this reference voltage, this comparator continues output logic 1 to this D type flip-flop, make to control this this power switch of switch driving circuit conducting, and control the lasting selection of this 2X1 multiplexer and export this first voltage, until this comparator is when relatively this first voltage is more than or equal to this reference voltage, this comparator output logic 0 is given this D type flip-flop, make to control this this power switch of not conducting of switch driving circuit, control this 2X1 multiplexer simultaneously and select this second voltage of output, and when this comparator when relatively this second voltage is greater than this reference voltage, this comparator continues output logic 0 to this D type flip-flop, until this comparator is when relatively this second voltage is less than or equal to this reference voltage, this comparator output logic 1 is given this D type flip-flop, and control this 2X1 multiplexer simultaneously and select this first voltage of output to this comparator.
7. LED driving circuit as claimed in claim 6, it is characterized in that, this control unit also comprises a mutual exclusion or lock and one or lock, an input of this mutual exclusion or lock connects the D end of this D type flip-flop, another input connects the Q end of this D type flip-flop, and its output connects an input of this or lock, this first pulse signal connects another input of this or lock, and should or the output of lock connect the pulse input end of this D type flip-flop, make this D type flip-flop according to should or second a pulse signal running of lock output.
8. LED driving circuit as claimed in claim 5, it is characterized in that, also comprise a DC voltage divider circuit, and this control unit comprises first, second, the the 3rd and the 4th totally four analog-digital converters and a correction module, wherein this DC voltage divider circuit comprises a filter circuit and a bleeder circuit, this filter circuit carries out filtering to export a direct voltage to this pulsating dc voltage, this bleeder circuit carries out dividing potential drop and exports a tertiary voltage this direct voltage, this first analog-digital converter turns to the first magnitude of voltage by this first voltage numerical digit, this second analog-digital converter turns to the second voltage value by this second voltage numerical digit, the 3rd analog-digital converter turns to reference voltage level by this reference voltage numerical digit, the 4th analog-digital converter turns to the tertiary voltage value by this tertiary voltage numerical digit, this correction module is according to a default standard voltage value, setting a corrected value is that this standard voltage value is divided by this tertiary voltage value, and proofread and correct this reference voltage level with this corrected value, make reference voltage level after this correction equal this corrected value and be multiplied by this reference voltage level.
9. LED driving circuit as claimed in claim 8, it is characterized in that, this control unit also comprises a judge module, this judge module is received this first magnitude of voltage, and in this first magnitude of voltage of judgement during the reference voltage level after being greater than this correction, control this this power switch of not conducting of switch driving circuit, otherwise, control this this power switch of switch driving circuit conducting, and this judge module is received this second voltage value, and in this second voltage value of judgement during the reference voltage level after being less than or equal to this correction, control this this power switch of switch driving circuit conducting, otherwise, control this this power switch of not conducting of switch driving circuit.
10. a LED driving circuit, is characterized in that, in order to drive the light-emitting diode (LED) module be comprised of several series-parallel light-emitting diodes, this LED driving circuit comprises:
A bridge rectifier, accept an alternating electromotive force and it carried out to rectification to export a pulsating dc voltage;
An inductance, an end and this bridge rectifier electric coupling, to accept this pulsating dc voltage, the other end and this light-emitting diode (LED) module one end be electric coupling forward, and the other end ground connection of this light-emitting diode (LED) module;
A power switch, have a first end, second end and one and determine this first end and this second end conducting whether controlled end, the other end electric coupling of this first end and this inductance;
An amplifying circuit, with the second end electric coupling of this power switch, and according to an enlargement ratio will flow through this power switch first an electric current corresponding conversion and zoom into first voltage;
A switch driving circuit, in order to whether to control this power switch conducting, when this power switch conducting, this first electric current is via this inductance this power switch of flowing through, make this inductive energy storage, and this amplifying circuit exports this first voltage, when this not conducting of power switch, this inductance release can, make flow through this light-emitting diode (LED) module to order about this light-emitting diode (LED) module luminous of one second electric current;
A generating circuit from reference voltage, produce a reference voltage according to this pulsating dc voltage; And
A control unit, control this switch driving circuit, and accept the input of this first voltage and reference voltage, and comprise a timer, when this control unit judges that this first voltage is less than this reference voltage, make this this power switch of switch driving circuit conducting, otherwise make this this power switch of not conducting of switch driving circuit, and start this timer and make a scheduled time of timing, and judge when this timer timing reaches this scheduled time, make this this power switch of switch driving circuit conducting, while forbidden energy this timer that makes zero, to receive once again and relatively this first voltage and this reference voltage.
11. LED driving circuit as claimed in claim 10, it is characterized in that, also comprise flow point volt circuit always, and this control unit also comprises three analog-digital converters, a correction module and a judge module, this DC voltage divider circuit comprises a filter circuit and a bleeder circuit, this filter circuit carries out filtering to export a direct current voltage to this pulsating dc voltage, this bleeder circuit carries out dividing potential drop and exports a tertiary voltage this direct voltage, these analog-digital converters are respectively by this first voltage, reference voltage and tertiary voltage numerical digit turn to the first magnitude of voltage, reference voltage level and tertiary voltage value, this correction module is preset with a standard voltage value, and setting a corrected value is that this standard voltage value is divided by this tertiary voltage value, and proofread and correct this reference voltage level with this corrected value, make reference voltage level after this correction equal this corrected value and be multiplied by this reference voltage level, when this judge module is received this first magnitude of voltage, and while judging the reference voltage level after this first magnitude of voltage is less than this correction, make this this power switch of switch driving circuit conducting, otherwise make this this power switch of not conducting of switch driving circuit, and when starting this timer and making timing reach this scheduled time, make this this power switch of switch driving circuit conducting, simultaneously forbidden energy this timer that makes zero, to receive once again and the reference voltage level after this first magnitude of voltage and this correction relatively.
12. a LED driving circuit, is characterized in that, in order to drive the light-emitting diode (LED) module be comprised of several series-parallel light-emitting diodes, this LED driving circuit comprises:
A bridge rectifier, accept an alternating electromotive force and it carried out to rectification to export a pulsating dc voltage;
An inductance, an end and this bridge rectifier electric coupling, to accept this pulsating dc voltage, the other end and this light-emitting diode (LED) module one end be electric coupling forward;
A power switch, have a first end, second end and one and determine this first end and this second end conducting whether controlled end, the other end electric coupling of this first end and this inductance, this second end ground connection;
An amplifying circuit, with the other end electric coupling of this light-emitting diode (LED) module, and according to an enlargement ratio will flow through this light-emitting diode (LED) module second an electric current corresponding conversion and zoom into a second voltage;
A switch driving circuit, in order to whether to control this power switch conducting, when this power switch conducting, first electric current is via this inductance this power switch of flowing through, make this inductive energy storage, when this not conducting of power switch, this inductance is released can, make flow through this light-emitting diode (LED) module to order about this light-emitting diode (LED) module luminous of this second electric current, and this amplifying circuit is exported this second voltage;
A generating circuit from reference voltage, produce a reference voltage according to this pulsating dc voltage; And
A control unit, control this switch driving circuit, and accept the input of this second voltage and reference voltage, and comprise a timer, when this control unit judges that this second voltage is less than or equal to this reference voltage, make this this power switch of switch driving circuit conducting, and start this timer and make one scheduled time of timing, and judge when this timer timing reaches this scheduled time, make this this power switch of not conducting of switch driving circuit, simultaneously forbidden energy this timer that makes zero, to receive once again and relatively this second voltage and this reference voltage.
13. LED driving circuit as claimed in claim 12, it is characterized in that, also comprise a DC voltage divider circuit, and this control unit also comprises three analog-digital converters, a correction module and a judge module, this DC voltage divider circuit comprises a filter circuit and a bleeder circuit, this filter circuit carries out filtering to export a direct voltage to this pulsating dc voltage, this bleeder circuit carries out dividing potential drop and exports a tertiary voltage this direct voltage, these analog-digital converters are respectively by this second voltage, reference voltage and tertiary voltage numerical digit turn to the second voltage value, reference voltage level and tertiary voltage value, this correction module is preset with a standard voltage value, and setting a corrected value is that this standard voltage value is divided by this tertiary voltage value, and proofread and correct this reference voltage level with this corrected value, make reference voltage level after this correction equal this corrected value and be multiplied by this reference voltage level, when this judge module judges the reference voltage level after this second voltage value is less than or equal to this correction, make this this power switch of switch driver conducting, and start this timer, while making timing reach this scheduled time, make this this power switch of not conducting of switch driver, simultaneously forbidden energy this timer that makes zero, to receive once again and the reference voltage level after this second voltage value and this correction relatively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101117772A TW201349925A (en) | 2012-05-18 | 2012-05-18 | LED driving circuit |
| TW101117772 | 2012-05-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103428957A true CN103428957A (en) | 2013-12-04 |
Family
ID=49652907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101587259A Pending CN103428957A (en) | 2012-05-18 | 2013-05-02 | Light emitting diode driving circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103428957A (en) |
| TW (1) | TW201349925A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105517232A (en) * | 2015-12-18 | 2016-04-20 | 成都飞凯瑞科技有限公司 | Intelligent light control system for LED lamps |
| CN105517231A (en) * | 2015-12-18 | 2016-04-20 | 成都飞凯瑞科技有限公司 | Intelligent control system of hybrid circuit for LED lamps |
| CN105554938A (en) * | 2015-12-18 | 2016-05-04 | 成都飞凯瑞科技有限公司 | Intelligent control system for LED lamp |
| WO2018214105A1 (en) * | 2017-05-25 | 2018-11-29 | 深圳和而泰智能照明有限公司 | Led driving circuit, led lighting apparatus, and electronic device |
| CN113811041A (en) * | 2020-06-16 | 2021-12-17 | 矽诚科技股份有限公司 | Light-emitting diode module with sleep mode and light-emitting diode lamp string |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572974A (en) * | 2009-04-17 | 2009-11-04 | 上海晶丰明源半导体有限公司 | High efficiency constant current LED drive circuit and drive method |
| WO2011026837A1 (en) * | 2009-09-04 | 2011-03-10 | Tridonic Ag | Operation of a pulse-width-modulated led |
| CN102098843A (en) * | 2011-01-13 | 2011-06-15 | 浙江大学 | LED driving circuit with high accuracy and low power consumption |
| CN102368662A (en) * | 2011-03-10 | 2012-03-07 | 杭州士兰微电子股份有限公司 | Current reference generation circuit, constant current switch power supply control circuit and control method thereof |
| CN102378450A (en) * | 2010-08-23 | 2012-03-14 | 夏普株式会社 | Led driver circuit and led lighting device using the same |
| CN203120247U (en) * | 2012-02-07 | 2013-08-07 | 江俊龙 | Light emitting diode driving circuit |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7659672B2 (en) * | 2006-09-29 | 2010-02-09 | O2Micro International Ltd. | LED driver |
| CN201142203Y (en) * | 2008-01-15 | 2008-10-29 | 青岛海信电器股份有限公司 | LED driving circuit and LCD device with the same |
| TWI395511B (en) * | 2008-08-07 | 2013-05-01 | Orise Technology Co Ltd | Led driver and power control circuit with spread spectrum frequency modulation function and display panel using the same |
| JP5470150B2 (en) * | 2010-04-23 | 2014-04-16 | ローム株式会社 | Switching power supply control circuit, control method, and light emitting device and electronic apparatus using them |
-
2012
- 2012-05-18 TW TW101117772A patent/TW201349925A/en not_active IP Right Cessation
-
2013
- 2013-05-02 CN CN2013101587259A patent/CN103428957A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101572974A (en) * | 2009-04-17 | 2009-11-04 | 上海晶丰明源半导体有限公司 | High efficiency constant current LED drive circuit and drive method |
| WO2011026837A1 (en) * | 2009-09-04 | 2011-03-10 | Tridonic Ag | Operation of a pulse-width-modulated led |
| CN102378450A (en) * | 2010-08-23 | 2012-03-14 | 夏普株式会社 | Led driver circuit and led lighting device using the same |
| CN102098843A (en) * | 2011-01-13 | 2011-06-15 | 浙江大学 | LED driving circuit with high accuracy and low power consumption |
| CN102368662A (en) * | 2011-03-10 | 2012-03-07 | 杭州士兰微电子股份有限公司 | Current reference generation circuit, constant current switch power supply control circuit and control method thereof |
| CN203120247U (en) * | 2012-02-07 | 2013-08-07 | 江俊龙 | Light emitting diode driving circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105517232A (en) * | 2015-12-18 | 2016-04-20 | 成都飞凯瑞科技有限公司 | Intelligent light control system for LED lamps |
| CN105517231A (en) * | 2015-12-18 | 2016-04-20 | 成都飞凯瑞科技有限公司 | Intelligent control system of hybrid circuit for LED lamps |
| CN105554938A (en) * | 2015-12-18 | 2016-05-04 | 成都飞凯瑞科技有限公司 | Intelligent control system for LED lamp |
| WO2018214105A1 (en) * | 2017-05-25 | 2018-11-29 | 深圳和而泰智能照明有限公司 | Led driving circuit, led lighting apparatus, and electronic device |
| CN113811041A (en) * | 2020-06-16 | 2021-12-17 | 矽诚科技股份有限公司 | Light-emitting diode module with sleep mode and light-emitting diode lamp string |
| CN113811041B (en) * | 2020-06-16 | 2024-03-05 | 矽诚科技股份有限公司 | LED module and LED light string with sleep mode |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201349925A (en) | 2013-12-01 |
| TWI462639B (en) | 2014-11-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101605417A (en) | The LED constant-current drive circuit of band light modulation | |
| CN103428957A (en) | Light emitting diode driving circuit | |
| CN103917028B (en) | A kind of LED constant current source and control method thereof | |
| CN104010421B (en) | Constant current output control device for LED drive circuit | |
| CN202551453U (en) | Constant-power light-emitting diode (LED) driving device | |
| CN105611684A (en) | Circuit for realizing light modulation via power switch and lamp | |
| CN104703330A (en) | LED lamp power supply circuit | |
| CN202076931U (en) | Non-electrolysis long-life stable-voltage constant current driving power supply | |
| CN202514138U (en) | Drive power supply for non-electrolytic capacitor | |
| CN208386413U (en) | A kind of Buck converter Bootstrapping drive circuit | |
| CN204069441U (en) | LED illumination non-isolated drive circuit | |
| CN201562997U (en) | Quick charging device for electric bike | |
| CN201774716U (en) | Constant-current driving power source for LED illumination | |
| CN104023445B (en) | A kind of LED drive circuit | |
| CN203120247U (en) | Light emitting diode driving circuit | |
| CN202033675U (en) | Temperature hysteresis control circuit | |
| CN202034908U (en) | Power supply adopting frequency inversion technology | |
| CN202663591U (en) | LED (light-emitting diode) resistance-capacitance type driver | |
| CN205124073U (en) | Utilize switch to realize circuit and lamps and lanterns of adjusting luminance | |
| JP5242288B2 (en) | Pulse generation circuit | |
| CN101650008A (en) | Strip lamp | |
| CN201623627U (en) | Power PFC circuit and television set having the same | |
| CN203827572U (en) | LED constant current source | |
| CN108235498A (en) | Free-standing solar LED lighting circuit | |
| CN206323194U (en) | A kind of chargeable LED desk lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131204 |